PHOTOSYNTHESIS
C 4 PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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mesophyll > bundle sheath
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bundle sheath > mesophyll
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bundle sheath only
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mesophyll only
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Detailed explanation-1: -Calvin cycle enzymes such as RubisCo is absent from the mesophyll cell of chloroplast of C4 plants. These enzymes are present in the bundle-sheath cells surrounding the vascular bundles, guard cells and epidermal cells of chloroplasts. So, the Calvin cycle occurs in the bundle-sheath cells.
Detailed explanation-2: -In the C4 pathway, initial carbon fixation takes place in mesophyll cells and the Calvin cycle takes place in bundle-sheath cells.
Detailed explanation-3: -C4 Photosynthesis C4 plants have a distinctive leaf anatomy (Kranz anatomy), with chloroplast-rich bundle-sheath cells, which form a gas-tight cylinder surrounding the vascular bundle.
Detailed explanation-4: -In C4 plants, oxaloacetic acid (OAA) is formed upon carbon fixation in mesophyll cells. The OAA is transported to bundle sheath cells, where it is reduced to malic acid. The malic acid undergoes decarboxylation and produces CO2 and pyruvic acid. CO2 is then fixed through Calvin cycle in the bundle sheath cells.
Detailed explanation-5: -So, the correct answer is ‘In C3 plant-mesophyll cell and In C4 plant-Bundle sheath cell’.